If these girls want to eat dairy then this is an excellent option. Not everyone wants to be vegan. I think a little bit of compassion is a lovely option. And to be fair, you also do not know what happens to the calves once moved. I called and spoke to the operators and they claim that they are used for breeding and/ or live out their lives.
It does not drain a mother. I don't suggest that dairy farms are generally good, because I have worked and studied on them and they are not, but Barambah is. I live near enough to be able to go there.